I am also experiencing this issue - I have tried unlinking and re-linking my steam account to twitch, but that didn't work for me - still showing the medal as unavailable and tells me to link my account in-game. Twitch shows all 3 of the medallions as redeemed. Please help.
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Nevermind, I'm sorted - I went to https://www.bungie.net/7/en/Codes/Partners hit refresh, then restarted the game. Shoutout to steinfeld9043 for posting his solution in a few replies.